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发明名称
Equalizer for twin-crank pumping units
摘要
申请公布号
US2268650(A)
申请公布日期
1942.01.06
申请号
US19400347656
申请日期
1940.07.26
申请人
BETHLEHEM STEEL COMPANY
发明人
EATON JOHN F.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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